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Physiological AdaptationAIDS = CD4 < 200 cells

HIV/AIDSNCLEX cheat sheet

HIV is a retrovirus that infects and destroys CD4 (helper) T-cells, progressively weakening cell-mediated immunity.

21 key facts 3 practice questions Reviewed Oct 2026
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Labs

  • CD4 < 200 = AIDS dx
  • Viral load: lower = better control
  • Confirm: ELISA → Western blot

Meds

  • ART daily, exact time, never skip
  • Adherence prevents resistance

Watch

  • Opportunistic: PCP pneumonia, TB
  • Kaposi sarcoma, candidiasis

Teach

  • Standard precautions, safe sex
  • Avoid live vaccines, raw food
Red flag to remember

New fever, productive cough, dyspnea, or oxygen desaturation may signal PCP or another opportunistic infection that must be reported now.

Before you read

Test yourself first: 3 questions

Question 1 of 3

A client with renal colic from a ureteral stone reports severe, intermittent, sharp flank pain radiating to the groin. Which nursing intervention is the PRIORITY?

What is hiv/aids?

AIDS is the advanced stage, defined by a CD4 count below 200 or the presence of an AIDS-defining opportunistic infection. It is transmitted through blood, semen, vaginal/rectal fluids, and breast milk, NOT through casual contact, hugging, or sharing utensils. Antiretroviral therapy (ART) suppresses viral load and lets people live long lives, but adherence is everything.

Key points to remember

  • HIV targets CD4 T-helper cells; as CD4 count falls, the patient becomes vulnerable to opportunistic infections.
  • Acute (seroconversion) illness looks like flu or mononucleosis: fever, fatigue, sore throat, rash, and lymphadenopathy.
  • AIDS is diagnosed when CD4 drops below 200 cells/mm3 or an AIDS-defining illness (PCP pneumonia, Kaposi sarcoma, esophageal candidiasis) appears.
  • Opportunistic infections such as Pneumocystis jirovecii pneumonia, TB, cytomegalovirus, and toxoplasmosis are the major causes of death.
  • Standard precautions are used for routine care; HIV alone does not require an isolation room.
  • An undetectable viral load on consistent ART means the virus is effectively untransmittable sexually (U=U).

Nursing priorities

  1. Reinforce strict, lifelong ART adherence at the same times daily; skipped doses drive resistance.
  2. Apply standard precautions consistently and monitor for and prevent opportunistic infections.
  3. Monitor CD4 count and viral load trends to gauge immune status and treatment response.
  4. Promote nutrition, vaccination per protocol, and prophylaxis (such as TMP-SMX) when CD4 is low.
  5. Provide nonjudgmental emotional support and connect the patient to counseling and community resources.

Labs & values

CD4 T-cell count normal 500-1600 cells/mm3 (AIDS-defining if below 200)
HIV viral load goal: undetectable (below ~20-50 copies/mL)
WBC normal5,000-10,000/mm3
5001600cells/mm Normal HIV/AIDS

Patient teaching

  • Take antiretroviral medication exactly as prescribed every single day, even when feeling well, to keep the virus undetectable.
  • Use condoms and do not share needles or razors; an undetectable viral load greatly lowers but should not replace barrier protection per provider guidance.
  • Avoid raw or undercooked foods, unpasteurized products, and contact with reptiles or cat litter to reduce infection risk.

Red flags: report now

  • New fever, productive cough, dyspnea, or oxygen desaturation may signal PCP or another opportunistic infection that must be reported now.
  • New neurologic changes (confusion, headache, focal deficits, seizures) can indicate toxoplasmosis or CNS lymphoma and need urgent evaluation.
  • A CD4 count falling below 200 demands prompt provider notification to start opportunistic-infection prophylaxis.
  • Never breastfeed if HIV positive in settings where safe formula is available; transmission risk is real.

References

Clinical references for this topic

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