Medical Emergencies · patient case question
Which laboratory value most requires medical consultation before the extraction, and why?
Patient case: HIV, and a Platelet Count of 18,000
Patient: 42-year-old male
Chief Complaint: Sore mouth and a broken tooth requiring extraction.
Background: HIV positive for eleven years. Recently changed antiretroviral regimen. Brings recent laboratory results.
Medications: Antiretroviral therapy
Vital Signs: BP 122/76 mmHg · HR 78 bpm · RR 16 · T 98.6°F
Findings: Laboratory: CD4 410 cells/µL, viral load undetectable, haemoglobin 13.1 g/dL, PLATELETS 18,000/µL, INR 1.0. Intraorally, removable white plaques on the buccal mucosa and palate that leave an erythematous base when scraped.
Show answer and explanation
Correct answer: D. The platelet count, because of the bleeding risk during and after surgery
- A. An UNDETECTABLE viral load means the infection is well suppressed, and it also means the patient is effectively non-infectious sexually. It reduces concern rather than raising it — and standard precautions apply to every patient regardless.
- B. A CD4 count of 410 is reasonably preserved — above 200 the risk of opportunistic infection is substantially reduced and routine dental care proceeds normally.
- C. Haemoglobin of 13.1 g/dL is within normal limits.
- D. CORRECT. A platelet count of 18,000/µL is SEVERE thrombocytopenia. The generally cited thresholds are: above 50,000 permits most routine dental surgery with local measures; 30,000–50,000 requires caution and consultation; and BELOW 30,000 carries a risk of spontaneous bleeding and mandates medical consultation, with platelet transfusion often needed before any surgical procedure. Immune thrombocytopenia is a well-recognised HIV-associated complication.
Note: Thresholds worth carrying: platelets above 50,000 for routine extraction; INR up to 3.5 for routine dental surgery without altering warfarin; absolute neutrophil count above 1,000 for elective care.
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