Interstitial nephritis laboratory findings: Difference between revisions
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== Overview == | == Overview == | ||
A variable combination of laboratory findings of TIN, such as rise in the plasma creatinine concentration, eosinophilia, eosinophiluria, changes of urine sediment, as well as evidences of tubulointerstitial damage based upon the culprit agent may present. | |||
In some studies a variable amount of proteinuria among older patients and NSAID-induced AIN has been reported, although nephrotic-range proteinuria among patients with TIN is rare. | |||
IgG4-related disease and hypocomplementemic interstitial nephritis | |||
— In addition to the above ndings, patients with IgG4-related disease or | |||
hypocomplementemic interstitial nephritis usually have elevated serum total IgG | |||
respectively [52,53]. may be more likely to have | |||
signicant proteinuria [59]. | |||
Occasional patients | |||
# Increased plasma creatinine | # Increased plasma creatinine | ||
# Eosinophilia and eosinophiluria | # Eosinophilia and eosinophiluria | ||
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Mohsen Basiri M.D.
Overview
A variable combination of laboratory findings of TIN, such as rise in the plasma creatinine concentration, eosinophilia, eosinophiluria, changes of urine sediment, as well as evidences of tubulointerstitial damage based upon the culprit agent may present.
In some studies a variable amount of proteinuria among older patients and NSAID-induced AIN has been reported, although nephrotic-range proteinuria among patients with TIN is rare.
IgG4-related disease and hypocomplementemic interstitial nephritis
— In addition to the above ndings, patients with IgG4-related disease or
hypocomplementemic interstitial nephritis usually have elevated serum total IgG
respectively [52,53]. may be more likely to have
signicant proteinuria [59].
Occasional patients
- Increased plasma creatinine
- Eosinophilia and eosinophiluria
- A characteristic urine sediment
- A variable degree of proteinuria
- Evidence of tubulointerstitial damage
- High fractional sodium excretion
Laboratory Findings
Blood
About 23% of patients have eosinophilia. Eosinophilia, when present, can be helpful in the evaluation of tubulointerstitial nephritis. However, this finding is neither specific nor sensitive enough to establish the diagnosis. Although the true incidence of eosinophilia in acute tubulointerstitial nephritis is unknown, it is estimated to be present in approximately half of patients. Typically, eosinophilia is absent in acute tubulointerstitial nephritis that is induced by nonsteroidal anti-inflammatory drugs (NSAIDs).
Urine
Urinary findings include:
- Eosinophiluria: sensitivity is 67% and specificity is 83%.[1] The sensitivity is higher in patients with interstitial nephritis induced by methicillin or when the Hansel's stain is used.
- Isosthenuria [2]
References
- ↑ Schwarz A, Krause P, Kunzendorf U, Keller F, Distler A (2000). "The outcome of acute interstitial nephritis risk factors for the transition from acute to chronic interstitial nephritis". Clin Nephrol. 54 (3): 179–90. PMID 11020015.
- ↑ Lins R, Verpooten G, De Clerck D, De Broe M (1986). "Urinary indices in acute interstitial nephritis". Clin Nephrol. 26 (3): 131–3. PMID 3769228.