Renal tubular acidosis complication of non-steroidal anti-inflammatory drugs induced interstitial nephritis and its complete resolution with steroids: A case report

Table 1 Laboratory work-up during admission and clinic follow-up

		On admission	On discharge	4-week follow-up (pre-biopsy)	Post-steroid therapy	3-months f/up	6-months f/up	Reference range	Unit
Serum chemistry	Sodium	140	135	142	139	137	137	135-145	mmol/L
	Potassium	1.5	4.2	3	4.4	3.7	3.9	3.6-5.1	mmol/L
	Chloride	118	108	115	107	105	105	96-110	mmol/L
	Bicarbonate	11	22	20	27	24	25	22-28	mmol/L
	Phosphorus	1.2	2.8	1.8	3.7	3.1	3.4	2.5-4.8	mg/dL
	Anion gap	11	5	7	5	8	7	8-12	mmol/L
	Creatinine	2	1.5	1.2	1.0	1.0	1.0	0.5-1.1	mg/dL
	eGFR (MDRD)	32	37	45	55	55	55	> 90	mL/minute/1.73 m2
Urine chemistry	UPCR	1.9		0.6	0.2	0.1	0.1	< 0.03	g/g
	Sodium	58						20-110	mmol/L
	Potassium	36						12-62	mmol/L
	Chloride	86						55-125	mmol/L
Urine	UA	Specific gravity 1.015, pH 6.5, 1+ protein, trace blood, trace leukocyte esterase
	Microscopy	10-20 WBCs, 0-2 RBCs, no bacteria and no casts (per high power field)

eGFR: Estimated glomerular filtration rate; MDRD: Modification of diet in renal disease; UPCR: Urine protein creatinine ratio; WBC: White blood cells; UA: Urinalysis.