Lab investigation in infection and immunological disorder in CVS

Patient with fever, TTE abnormal. Gram stain from Hemoculture as shown here. Which answer is NOT matching?

• MRSA

• IVDU

• RHD

• Acute IE

• MSSA

A 27-year-old man presents with a 2-week history of fever, fatigue, and weight loss. On physical examination, he has a new systolic murmur, splinter hemorrhages, and painless erythematous macules on the palms and soles. He also has tender nodules on his fingers. He reports a recent dental procedure performed without antibiotic prophylaxis.

Which of the following is the most likely causative organism?

• Staphylococcus aureus

• Streptococcus pyogenes

• Streptococcus pneumoniae

• Streptococcus mitis

How long is the incubation period for hemoculture?

• 24 hrs.

• 2 days

• 3 days

• 5 days

• 7 days

How to handle and transport hemoculture sample before sending to the lab?

• keep and transport in the cool box

• keep in the freezer until clerk available

• keep and transport in room temperature

• keep in the 37^oC incubator until specimen delivery

Which test can be used as a biomarker for diagnosis of septic shock?

• Erythrocyte sediment rate

• C-reactive protein

• CBC

• Procalcitonin

• Calcitonin

Which tests are positive in Libman–Sacks endocarditis?

• ASO

• Anti-dsDNA

• Hemoculture

• Anti-DNase B

• Anticardiolipin Ab