Table 2. Laboratory Studies on Initial Presentation.

Laboratory study	Median (IQR)
White blood cell count, /μL	15 300 (12 300-17 900)
Differential, median (IQR), %
Granulocytes	90.3 (88.0-92.4)
Lymphocytes	5.7 (4.2-7.9)
Monocytes	2.4 (2-3.2)
Basophils	0.2 (0.1-0.3)
Eosinophils	0.3 (0.1-0.9)
ESR, mm/h	75 (42-100)
CRP, mg/dL	25.8 (18.7-30.2)
Elevated, No./total No. (%)
ESRa	25/26 (96)
CRPb	27/27 (100)
ESR or CRP	28/28 (100)
ESR >100 mm/h	7/26 (27)
Procalcitonin, ng/mL	0.3 (0.1-0.7)
Creatinine, mg/dL	0.85 (0.73-0.94)
Total bilirubin, mg/dL	1.0 (0.6-1.4)
AST, U/L	31 (25-37)
ALT, U/L	24 (18-39)
Elevated, No./total No. (%)
ASTc	6/30 (20)
ALTd	5/30 (17)
AST or ALT	7/30 (23)
Alkaline phosphatase, U/L	85 (72-114)
HIV 1, 2 antigen or antibody
Negative, No./total No. (%)	19/19 (100)
BAL performed, No./total No. (%)	24/31 (77)
Cytologic differential, %
Macrophages	53 (33-79)
Neutrophils	28 (12-48)
Lymphocytes	6 (2-12)
Eosinophils	0 (0-2)
Presence of LLMs, No./total No. (%)e	21/23 (91)
LLMs, median (IQR), %	52 (33-76)
Urine drug screen, No./total No. (%)
Marijuana	11/11 (100)
Cocaine	0/11
Heroin	0/1
Methamphetamine	1/11 (9)
Narcotics	2/11 (18)
Benzodiazepine	0/11
Methadone	0/11
Buprenorphine	0/11

Abbreviations: ALT, alanine aminotransferase; AST, aspartate aminotransferase; BAL, bronchoalveolar lavage; CRP, C-reactive protein; ESR, erythrocyte sedimentation rate; IQR, interquartile range; LLM, lipid-laden microphage.

SI conversion factors: To convert AST, ALT, and alkaline phosphatase to microkatals per liter, multiply by 0.0167; creatinine to micromoles per liter, multiply by 76.25; CRP to milligrams per liter, multiply by 10; total bilirubin to micromoles per liter, multiply by 17.104; and white blood cell count to ×10⁹/μL, multiply by 0.001.

^aGreater than upper reference limit (20 mm/h).

^bGreater than upper reference limit (0.8 mg/dL).

^cGreater than upper reference limit (40 U/L).

^dGreater than upper reference limit (60 U/L).

^eOne patient who underwent BAL did not have LLM testing performed.