Match the following patient clinical presentations to the most appropriate initial laboratory evaluation to establish a diagnosis.
- A 42-year-old woman with a BMI of 32 kg/m², acanthosis nigricans, and recent onset of increased thirst and frequent urination.Hemoglobin A1c measurement
- A 24-year-old pregnant woman at 26 weeks gestation presenting for a routine second-trimester prenatal care visit.1-hour 50-g oral glucose challenge test
- A 55-year-old man with acute onset of severe, excruciating pain, swelling, and erythema of the first metatarsophalangeal joint.Arthrocentesis for synovial fluid crystal analysis
- An 18-year-old man with a 2-day history of sore throat, fever of 39.0°C (102.2°F), tonsillar exudates, and absence of cough.Rapid streptococcal antigen test
Cevap
Symptoms of type 2 diabetes mellitus match with Hemoglobin A1c measurement; a routine 26-week pregnancy visit matches with the 1-hour 50-g oral glucose challenge test; an acute podagra presentation matches with arthrocentesis for crystal analysis; and pharyngitis meeting Centor criteria matches with the rapid streptococcal antigen test.
Each correct pairing matches a classic clinical vignette with its gold-standard initial laboratory or diagnostic test. The 42-year-old woman shows clear signs of insulin resistance and hyperglycemia, warranting a Hemoglobin A1c test. The 24-year-old pregnant woman is at the standard gestational age for gestational diabetes screening using the 50-g oral glucose challenge. The 55-year-old man presents with podagra, requiring joint aspiration (arthrocentesis) to confirm gout and rule out infection. The 18-year-old meets Centor criteria for suspected strep throat, requiring confirmation with a rapid strep test before empiric treatment.
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Anahtar Kavram
Selecting the most appropriate initial diagnostic laboratory test based on the patient's acute clinical presentation, demographic risk factors, and established screening guidelines.