Hey Grok, can you tell me about Anti-68KD (Hsp-70) Antibodies test? I understand it’s a blood test for auto immune caused hearing loss?
THOUGHTS
Yes, Donna — you’re exactly right. The Anti-68 kD (Hsp-70) antibody test is a blood test most commonly used to help support the diagnosis of autoimmune inner ear disease (AIED), also called autoimmune sensorineural hearing loss.
Here’s a clear breakdown of what it is, what it means, and its role in practice:
What the test actually measures
• The test looks for IgG antibodies against a protein called the 68-kDa antigen, which was later identified as heat shock protein 70 (Hsp-70).
• This protein is found in many tissues (including the inner ear), but antibodies to it have been particularly associated with immune-mediated damage to the inner ear.
• The test is usually performed using Western blot or line blot immunoassay methods (offered by labs like Mayo Clinic, Labcorp, ARUP, Cleveland Clinic Labs, etc.).
Connection to hearing loss
• It’s mainly used in people with rapidly progressive, fluctuating, or asymmetric sensorineural hearing loss (SNHL) that doesn’t have an obvious other cause (idiopathic).
• Autoimmune inner ear disease (AIED) is relatively rare but important because — unlike most forms of hearing loss — it can often respond well to immunosuppressive treatment if caught early.
• The presence of these antibodies is considered one of the few serological markers that can point toward an autoimmune cause of hearing loss.
How common is a positive result?
Studies over the years show quite a range (depending on patient selection and testing method), but roughly:
A positive test is more specific than sensitive — meaning if it’s positive, it strongly supports considering an autoimmune process, but a negative test does not rule out AIED.
Clinical usefulness
• A positive result is often taken as supportive evidence to try high-dose corticosteroids (e.g., prednisone 1 mg/kg/day with a slow taper), because studies consistently show that people who are positive for these antibodies are more likely to respond to steroids.
• Antibody levels sometimes fluctuate with disease activity, so serial testing is occasionally used to monitor response or decide on ongoing immunosuppression.
• It’s not a standalone diagnostic test — diagnosis of AIED still relies heavily on:
• Clinical history (rapid/fluctuating hearing loss, sometimes vertigo/tinnitus)
• Audiograms showing sensorineural pattern
• Ruling out other causes (infections, tumors, genetic, etc.)
• Response to a trial of steroids
Limitations and caveats
• These antibodies can occasionally appear in other autoimmune conditions, some infections, or even (rarely) healthy people.
• Not every lab offers it, and results can vary slightly depending on the exact method.
• A negative test doesn’t mean steroids won’t help — some patients with AIED are negative but still respond.
In your situation — with known diffuse systemic sclerosis, positive anti-Scl-70 and anti-RNP, possible lupus overlap, and asymmetric sensorineural hearing loss — this test makes sense as part of the workup to see if there’s an autoimmune component specifically attacking the inner ear (either as part of your systemic disease or as a separate/overlap process).
Have you had this test done already, or are you thinking about asking your rheumatologist or ENT to order it? If you have results (positive/negative + any titer info), feel free to share and I can help interpret them in your context.