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typhoid diagnostic tests
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CDC typhoid fever diagnosis blood culture serologic tests
Interpretation of the report for a 10-year-old girl
Main finding: mild anemia
- Hemoglobin: 10.5 g/dL - low for age
- Hematocrit (PCV): 34.7% - slightly low
- MCH 26.18 pg and MCHC 30.26 g/dL - low
- MCV 86.5 fL - normal
This indicates mild anemia, with relatively low hemoglobin content in red cells. Iron deficiency is a common cause in children, although this CBC alone cannot confirm it. A pediatrician may consider serum ferritin, iron studies, dietary review, and evaluation for blood loss or worms when appropriate. Do not start iron solely from this report without a clinician's advice.
White cells
- Total leukocyte count: 8,600/mm³ - normal
- Absolute lymphocyte count: 4,730/mm³ - elevated on this lab's range
- Neutrophils/absolute neutrophil count: normal
An isolated mild rise in lymphocytes can occur with many viral illnesses and is not specific for typhoid. It should be interpreted with symptoms and examination.
Platelets
- 1.60 lakh/mm³ - within the lab's normal range, though near the lower end.
- No current platelet pattern suggestive of dengue-related thrombocytopenia.
Infection tests
- Malaria parasite: not seen
- Dengue NS1 antigen: negative
- Dengue IgM and IgG: negative
- Typhidot IgM: positive
- Typhidot IgG: negative
What the Typhidot result means
A positive Typhidot IgM can be compatible with a recent typhoid/enteric fever infection, but it does not prove typhoid by itself. Rapid antibody tests can give false-positive results and cannot reliably distinguish all acute infections from previous exposure in every setting. The preferred confirmation is a blood culture, ideally collected before antibiotics, with antibiotic-susceptibility testing if Salmonella is grown. The CDC clinical guidance states that blood culture is the main diagnostic test and notes that serologic tests have important limitations. Multiple cultures may be needed.
What to do now
Arrange a same-day pediatrician review if she has fever, abdominal pain, headache, vomiting, poor appetite, diarrhea/constipation, or marked tiredness. Take the complete report. The clinician can decide whether to order:
- Blood culture before treatment, if feasible.
- Repeat CBC if fever persists or clinical condition changes.
- Ferritin/iron studies for anemia.
Seek urgent care today if any of these occur
- Persistent high fever or fever with worsening condition
- Severe abdominal pain, repeated vomiting, abdominal swelling
- Confusion, excessive sleepiness, fainting, breathing difficulty
- Unable to drink or passing very little urine
- Blood in stool/vomit, black stools, unusual bleeding/bruising
In short: mild anemia is present; malaria and dengue tests are negative; Typhidot IgM raises the possibility of typhoid but needs clinical assessment and preferably blood-culture confirmation.
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