Table.

Initial laboratory results of a 77-year-old man with a rapid change in mental status.

Test name	Patient value	Reference range
Complete blood count
Hemoglobin	10.4	11.9–15.7 g/dL
Hematocrit	32.3	35.0–45.0%
White blood count	18.2	4.5–11 K/mcL
Platelet	187	153–367 K/mcL
Neutrophils	72.5	42.6–74.5%
Lymphocytes	10.3	20.8–50.5%
Monocytes	16.2	2.0–10.3%
Eosinophils	0.2	0.9–2.9%
Complete metabolic panel
Sodium	132	136–145 mmol/L
Potassium	4.0	3.5–5.1 mmol/L
Chloride	102	98–107 mmol/L
Bicarbonate	24	21–30 mmol/L
Glucose	147	70–99 mg/dL
Blood urea nitrogen	21	7–17 mg/dL
Creatinine	0.74	0.52–1.04 mg/dL
Calcium	7.8	8.6–10.2 mg/dL
Magnesium	1.5	1.6–2.6 mg/dL
Phosphorus	2.9	2.5–4.5 mg/dL
Total protein	5.2	6.3–8.2 g/dL
Total bilirubin	1	0.3–1.2 mg/dL
Aspartate aminotransferase	46	14–36 units/L
Alanine aminotransferase	21	0–34 units/L
Alkaline phosphatase	82	38–126 units/L
Coagulation
Protime	15.9	12.1–15.0 seconds
International normalized ratio	1.3	0.8–1.1
Partial thromboplastin time	45	25–38 seconds
Fibrinogen	280	200–400 mg/dL
Thyroid
Thyroid stimulating hormone	0.01	0.4–4 mIU/L
Free Thyroxine	6.6	0.8–1.8 ng/dL
Additional tests
Lactate	1.7	0.5–2.2 mmol/L
Ammonia	9	9–30 mcmol/L
Troponin I	0.02	<0.06 ng/mL

dL, deciliter; g, grams; K, thousands; mcL, microliter; mcmol, micromole; mg, milligram; mIU, milli-international units; mmol, millimole; ng, nanogram; L, liter.