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Patient has fever what reports tells and what need to be done next
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fever AND complete blood count
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CDC fever adults when to seek emergency care symptoms
This CBC does not identify the exact cause of fever, but it gives useful clues:
| Finding | Result | Meaning |
|---|---|---|
| Total WBC/TLC | 8,310 | Normal. No strong CBC evidence of a typical bacterial infection. |
| Neutrophils | 31% | Low relative percentage |
| Lymphocytes | 60% | Raised relative percentage, which can occur with a viral illness |
| Platelets | 2.97 lakh/cumm | Normal. This is reassuring, but a normal platelet count does not rule out early dengue or other infections. |
| Hb | 11.8 g/dL | Near the lab's normal range |
| MCV 66.5, MCH 20, MCHC 30 | Low | Red cells are small and carry less hemoglobin: microcytic, hypochromic pattern |
| RBC count | 5.9 million/cumm | Slightly high |
What this could mean
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For the fever: Normal total WBC with lymphocyte predominance often fits a viral infection, but it cannot confirm this or exclude dengue, malaria, typhoid, urinary infection, COVID/flu, etc. The symptoms, physical examination, fever duration, local outbreaks, travel and mosquito exposure determine the next tests.
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Separate issue found on CBC: The low MCV/MCH with a relatively high RBC count can occur with thalassemia trait. Iron deficiency is another possibility, especially as RDW is mildly high. This is usually not the cause of an acute fever but should be checked after the fever episode.
What to do next
- See a clinician today if fever is persisting beyond 24-48 hours, is high, or the patient looks unwell. Take this report along.
- The clinician may select tests based on symptoms and location, commonly:
- malaria test if chills/rigors or mosquito exposure
- dengue NS1 antigen or PCR during early illness, followed by IgM later when appropriate
- urine routine/culture if burning urine, frequency, abdominal/back pain
- COVID-19/flu test if cough, sore throat, body aches
- CRP, liver/kidney tests, blood culture only when clinically indicated
- Repeat CBC in 24-48 hours if fever continues or if dengue is suspected, especially to monitor platelets and hematocrit.
- After recovery, ask for serum ferritin/iron studies and, if iron deficiency is not shown, Hb electrophoresis/HPLC to assess for thalassemia trait. Do not start long-term iron solely from this CBC without medical advice.
At home meanwhile
- Encourage fluids, oral rehydration solution, light food, and rest.
- For fever, use paracetamol only as advised for the patient’s age/weight. Avoid aspirin. Avoid ibuprofen/diclofenac unless a clinician says they are suitable, particularly while dengue is a possibility.
- Monitor temperature, urine output, vomiting, rash, and bleeding.
Get urgent emergency care now if there is
Breathing difficulty, confusion/unusual sleepiness, stiff neck, seizure, severe headache, persistent vomiting, severe abdominal pain, dehydration or very little urine, fainting, rash with bleeding, nose/gum bleeding, blood in vomit/stool, or rapidly worsening condition. Dengue warning signs such as abdominal pain, repeated vomiting, bleeding, or marked weakness need immediate assessment, as noted by the CDC dengue guidance.
The current platelet count is reassuring, but the next decision depends mostly on how many days of fever, highest temperature, and accompanying symptoms.
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