Table 1.

Laboratory results of a critically ill 79‐year‐old Japanese man with COVID‐19

Variable	Seven days before admission †	At the emergency department	Day 13 of hospitalization
White‐cell count (per mm3)	4,,400	8,670	14,520
Lymphocyte count (per mm3)	1,100	1,040	990
Hemoglobin (g/dL)	16.8	15.2	9.5
Hematocrit (%)	48.8	42.9	27.7
Platelet count (per mm3)	129,000	152,000	149,000
Sodium (mmol/L)	138	138	144
Potassium (mmol/L)	4.2	4.1	4.1
Chloride (mmol/L)	98	107	117
Urea nitrogen (mg/dL)	24.3	18.8	28.1
Creatinine (mg/dL)	1.1	1.1	1.7
Aspartate aminotransferase (IU/L)	36	118	60
Alanine aminotransferase (IU/L)	23	61	27
Lactate dehydrogenase (IU/L)	215	717	453
Total bilirubin (mg/dL)	0.9	1.1	6.3
International normalized ratio	Not done	1.14	1.50
Fibrinogen (mg/dL)	Not done	703	498
C reactive protein (mg/dL)	6.7	23.5	22.0
Procalcitonin (ng/mL)	Not done	0.43	Not done
Arterial blood gas analysis
pH	Not done	7.443 ‡	7.434 §
PaO2 (mmHg)	Not done	75.5 ‡	89.7 §
PaCO2 (mmHg)	Not done	34.0 ‡	29.1 §
${\text{HCO}}_3^{-}$ (mmol/L)	Not done	24.5 ‡	19.2 §
Lactate (mmol/L)	Not done	1.2 ‡	1.2 §
Rapid antigen test
Rapid antigen test for influenzae virus	Negative	Negative	Not done
Rapid urinary antigen test for Pneumococcus	Not done	Negative	Not done
Rapid urinary antigen test for Legionella	Not done	Negative	Not done

^†Laboratory tests carried out at the initial hospital.

^‡Analysis undertaken while patient was receiving 10 L/min oxygen through a face mask with reservoir.

^§Analysis undertaken while patient was under mechanical ventilation using pressure support mode with positive end‐expiratory pressure 8 cmH₂O and FiO₂ 0.5.