What Are Döhle Bodies and What Do They Signal?

Döhle bodies are small, pale blue-gray patches found inside neutrophils, the white blood cells that serve as your body’s first responders against infection. Spotted under a microscope on a standard blood smear, they signal that neutrophils have been rushed out of the bone marrow before fully maturing, usually because the body is fighting a serious infection or dealing with significant physical stress. Their appearance in a blood film is one of the quickest visual clues a pathologist can use to suspect conditions like sepsis, though the story of what triggers them and what they can be confused with is broader than most people realize.

What Döhle Bodies Actually Are

When you look at a healthy neutrophil under a microscope, the cytoplasm (the gel-like space outside the nucleus) appears relatively clear and evenly granulated. Döhle bodies show up as small, round or oval inclusions within that cytoplasm, stained a light blue or blue-gray with a standard Wright or Giemsa stain. They are remnants of rough endoplasmic reticulum, the cell’s protein-making machinery. Normally, as neutrophils mature in the bone marrow, they break down and recycle most of this machinery. But when the body urgently needs more neutrophils, it pushes immature cells into the bloodstream before they have finished cleaning house. The leftover ribosomal material clumps together, and those clumps are what pathologists see as Döhle bodies.

Their borders tend to look hazy and indistinct, almost cloud-like, which is an important detail when distinguishing them from similar-looking inclusions caused by genetic conditions. They are usually found near the cell’s outer edge, and a single neutrophil can contain one or several.

Why They Appear and What They Signal

The classic trigger is bacterial infection, especially severe infection progressing toward sepsis. In one observational study comparing patients with systemic inflammatory response syndrome (SIRS), Döhle bodies were found in about 17% of patients who had confirmed sepsis but in none of the patients with SIRS alone, a stark difference that held up statistically.¹ That makes them a useful red flag. When a pathologist scanning a blood film spots Döhle bodies alongside toxic granulation (dark, coarse granules) and cytoplasmic vacuoles (small clear holes), the combination strongly suggests bacterial infection rather than a noninfectious source of inflammation.

But infection is not the only cause. Döhle bodies have been documented after severe burns, appearing in every patient examined in one early study, with the percentage of affected neutrophils ranging from about 1% to 66% depending on the severity of the injury.² That same study noted their presence after other forms of tissue trauma, including surgical wounds. Any situation that forces the bone marrow to ramp up neutrophil production in a hurry can produce them.

Döhle Bodies in Pregnancy

One of the more surprising triggers is ordinary, uncomplicated pregnancy. A large screening study examined blood films from 500 pregnant women and found Döhle bodies in nearly all of them: only 9 out of 500 films lacked them. Serial monitoring of 15 pregnancies through all three trimesters and into the postpartum period showed Döhle bodies appearing consistently throughout. Meanwhile, a separate control group of 500 nonpregnant women showed none.³

This finding matters because it means Döhle bodies on a blood smear from a pregnant patient should not automatically trigger alarm about infection. Pregnancy itself drives increased white blood cell production, and the mild left shift that results (more immature neutrophils entering the bloodstream) is enough to generate these inclusions. A clinician who sees Döhle bodies in a pregnant patient’s blood film needs to weigh the entire picture, including symptoms, other lab markers, and whether toxic granulation and vacuolization are also present, before concluding that infection is the cause.

The “Toxic Change” Triad

Pathologists rarely evaluate Döhle bodies in isolation. They are one piece of a broader pattern called “toxic changes” in neutrophils, which includes three main features: toxic granulation, cytoplasmic vacuolization, and Döhle bodies themselves.⁴ The word “toxic” here is a bit misleading; it does not mean the cell has been poisoned. It refers to the visual appearance of neutrophils that were produced quickly under stress.

Each feature tells a slightly different part of the story. Toxic granules are the most common finding, showing up in the majority of sepsis cases. Cytoplasmic vacuoles typically indicate that the neutrophil has been actively engulfing bacteria or other material. Döhle bodies indicate the cell’s immaturity. When all three appear together, the combination carries more diagnostic weight than any one alone. In the SIRS-versus-sepsis study mentioned earlier, toxic granules were found in about 56% of the sepsis group and vacuoles in about 31%, compared to 12.5% and 6.3% in the group without sepsis.⁵ The gradient of these findings helps the clinician gauge how aggressively the body is responding.

One case report involving bacterial sepsis illustrated the full spectrum vividly: the patient’s blood smear showed a flood of immature neutrophils with toxic granules, vacuoles containing rod-shaped bacteria visible inside the cells, and Döhle bodies appearing as pale blue spots at the cytoplasm’s margins.⁶

Döhle Bodies in Newborns

Detecting sepsis in premature and newborn infants is notoriously difficult because their symptoms are vague and overlap with many other conditions. Blood cultures, the gold standard, can take days to come back. This is where morphological clues like Döhle bodies become particularly valuable. Research in premature infants found that qualitative neutrophil changes, including Döhle bodies, toxic granulation, and vacuolization, appeared more frequently in infants with confirmed bacterial infections and, combined with band cell counts, provided a reliable early signal.⁷

A separate study of neonatal sepsis found that morphological changes in neutrophils were detected in roughly 68% of culture-proven cases and over 90% of probable cases, making them one of the more sensitive early indicators when used alongside other markers like C-reactive protein and the ratio of immature to total neutrophils.⁸ For neonatologists, seeing Döhle bodies on a smear from a sick newborn can tip the decision toward starting antibiotics before cultures confirm the diagnosis.

The Genetic Look-Alike You Should Know About

Not every inclusion that resembles a Döhle body is one. A group of inherited conditions collectively called MYH9-related disorders produce inclusions in neutrophils that can look almost identical under routine staining. The most well-known of these is May-Hegglin anomaly, a rare disorder caused by mutations in the MYH9 gene on chromosome 22, which encodes a protein involved in cell structure.⁹ People with May-Hegglin anomaly have abnormally large platelets, low platelet counts, and Döhle body-like inclusions in their white blood cells. The condition is inherited in an autosomal dominant pattern, meaning only one copy of the mutated gene is enough to cause it.

Telling the two apart matters clinically. A case report describing a 33-year-old woman who arrived at the hospital for a planned surgery found that her blood smear showed large platelets and Döhle body-like inclusions. Genetic testing confirmed a mutation in the MYH9 gene and a diagnosis of May-Hegglin anomaly, a condition she had been living with unknowingly.¹⁰ Misidentifying her inclusions as true Döhle bodies could have sent clinicians on a wild goose chase looking for an infection that was never there.

How to Tell True Döhle Bodies from MYH9 Inclusions

There are several morphological and clinical differences that help pathologists distinguish the two. True Döhle bodies tend to be small, roundish, and have fuzzy, indistinct borders, while the look-alike inclusions from MYH9 disorders are distributed along the cell’s periphery with sharper, more well-defined edges. True Döhle bodies are almost always accompanied by other signs of toxic change, specifically toxic granules and cytoplasmic vacuoles, reflecting the infectious or inflammatory state that produced them. MYH9 inclusions appear in the absence of those other toxic features. Perhaps the most telling difference is persistence: true Döhle bodies disappear once the underlying infection or stress resolves, while MYH9 inclusions remain for life. The presence of abnormally large platelets alongside the inclusions is another strong hint toward an MYH9 disorder rather than an infection-related Döhle body.¹¹

This distinction has real consequences. MYH9-related disorders exist on a spectrum that includes several named syndromes (Sebastian, Epstein, and Fechtner syndromes among them), some of which carry a risk of kidney disease, hearing loss, or cataracts later in life.¹² Catching the inclusions on a routine blood smear and recognizing them as something other than infection-related Döhle bodies can lead to a genetic diagnosis that changes a patient’s long-term monitoring plan.

Automated Detection in the Modern Lab

Traditionally, spotting Döhle bodies required a trained human eye squinting through a microscope at a stained blood film. That is still how most diagnoses happen, but technology is catching up. One digital image analysis system achieved 100% sensitivity for detecting toxic neutrophil abnormalities, including Döhle bodies, toxic granules, and vacuolization, meaning it flagged every case that a trained microscopist would have caught.¹³

More recent work has pushed further, using deep learning to classify neutrophil abnormalities from digital images. A system called NeuNN, trained on over 5,600 neutrophil images across seven categories (including a dedicated Döhle body category), achieved about 94% overall accuracy in identifying normal neutrophils versus those with various inclusions or abnormalities.¹⁴ These systems are not replacing pathologists, but they are useful as screening tools, especially in high-volume labs where thousands of smears are processed daily and subtle findings might otherwise be missed on a busy shift.

Another approach being piloted in the UK uses partial-slide digital imaging, where a virtual microscopy scan of the blood film is reviewed on screen instead of through the eyepiece. Early results found that subcellular features like Döhle bodies, basophilic stippling, and Auer rods could be reliably assessed with this hybrid method, suggesting that morphological review could shift increasingly to digital workflows without sacrificing diagnostic accuracy.¹⁵

The Pre-Analytical Pitfall With Stored Blood Samples

Here is something that can trip up even experienced lab workers: Döhle body-like inclusions can appear as an artifact of delayed blood processing, particularly in certain species. A study in cats found that the percentage of neutrophils showing Döhle or Döhle-like inclusions increased significantly when blood sat in collection tubes for eight hours at room temperature or for 24 hours when refrigerated. Samples stored at room temperature showed more of these inclusions than those kept cold, though both were affected.¹⁶

While this particular study focused on feline blood, the principle matters for human diagnostics as well. Any delay between drawing blood and preparing the smear introduces the possibility of cell degradation that mimics pathological findings. Labs generally know this and try to prepare smears promptly, but in emergency departments or settings where samples sit in a queue, it is worth being aware that apparent Döhle bodies might be storage artifacts rather than a reflection of what was happening in the patient’s body. The takeaway for lab practice is straightforward: prepare the blood film as soon as possible after the draw.

Döhle Bodies in Veterinary Medicine

Cats are particularly prone to developing Döhle bodies, and veterinary hematologists encounter them more routinely than their counterparts in human medicine. In cats, Döhle bodies appear not only during infections but also during stress responses and, as the storage study noted, as artifacts when samples are not processed quickly. Because feline neutrophils seem to develop these inclusions more readily than human neutrophils, interpreting their significance requires more context. A few Döhle bodies on a cat’s blood film might be clinically meaningless, while a large number combined with other toxic changes would raise the same alarm as in a human patient.

This species difference is a good reminder that Döhle bodies are not a yes-or-no diagnostic finding. Their significance depends on how many are present, what else is happening on the smear, and the clinical picture of the patient, whether that patient walks on two legs or four.

When Döhle Bodies Disappear

One of the practical advantages of tracking Döhle bodies is that they are transient. Once the underlying infection is treated and the bone marrow no longer needs to rush out immature cells, the inclusions vanish from subsequent blood films. This makes them useful not just for initial diagnosis but also for monitoring treatment response. A patient who starts antibiotics for a severe infection and whose follow-up smear shows fewer Döhle bodies and less toxic granulation is likely responding to therapy, even before formal culture results confirm it.

This transient nature is also what separates them cleanly from the MYH9-related inclusions discussed earlier. If Döhle body-like inclusions persist on repeated smears over weeks or months with no clear infection or inflammatory trigger, the smart move is to consider a genetic cause and look for the associated findings of large platelets and low platelet counts. Some patients with MYH9 disorders go undiagnosed for years because their inclusions are written off as incidental Döhle bodies, and their low platelet counts are attributed to other causes. The finding only clicks into place when someone recognizes the pattern.