The GCA medical abbreviation means giant cell arteritis, a swelling of the walls of large and medium sized arteries, most often those running along the temples and sometimes the aorta and its main branches. It occurs mainly in people over 50, and it is the same condition many people know as temporal arteritis.
GCA appears in rheumatology and eye clinic notes, emergency records, biopsy requests and pharmacy reviews. Clinicians treat a suspected case as urgent because the inflammation can reduce blood flow to the eye and cause vision loss. This page explains the term, the clues and tests charted with it, and the abbreviations it travels with.
At a glance
Stands for
Giant cell arteritisAlso called
Temporal arteritis, cranial arteritisName origin
Large inflamed cells, called giant cells, seen under the microscopeUsed in
Rheumatology, ophthalmology, neurology, emergency medicineLinked condition
PMR, polymyalgia rheumaticaDo not confuse with
CGA, same letters in another order
What the GCA medical abbreviation describes
Giant cell arteritis is a vasculitis, meaning inflammation of blood vessel walls. The swollen wall narrows the artery and can reduce blood flow to the tissues beyond it. The name comes from what pathologists see in a biopsy: clusters of unusually large immune cells called giant cells in the artery wall.
Common symptoms include a new headache, often at the temples, tenderness of the scalp, pain in the jaw when chewing, fatigue, fever and weight loss. Vision changes such as blurring, double vision or sudden loss of sight in one eye are the most feared features. About half of people with GCA also have symptoms of polymyalgia rheumatica, with stiffness in the shoulders and hips.
Reading a GCA line in a note
| Chart wording | Plain meaning |
|---|---|
| New temporal HA | A new headache at the side of the head |
| Jaw claudication | Jaw pain or tiredness that comes on with chewing |
| ESR 88 | A high sedimentation rate, a blood marker of inflammation |
| CRP | C reactive protein, another inflammation marker |
| TA bx | Temporal artery biopsy, a small sample of the artery |
| US temporal arteries | Ultrasound looking for a swollen artery wall |
The ESR and CRP are usually raised but are not specific to GCA. Labs set their own reference ranges.
Why notes treat suspected GCA as urgent
Emergency note: "72F, 3 wk temporal HA, transient vision loss R eye this AM, concern for GCA, steroids started, rheum and ophtho consulted." Because a short episode of lost vision can be followed by permanent loss, the team started glucocorticoid treatment right away and asked rheumatology and the eye service to see her, without waiting for the biopsy.
Starting treatment before the biopsy is common because the biopsy can still show changes for a period after steroids begin. The specific medicines and schedule are decided by the treating team.
For students and scribes
When charting a possible GCA case, record the onset of the headache, any jaw symptoms, every vision change with its timing, and shoulder or hip stiffness. Note the time steroids were given, since biopsy timing is planned around it. Pharmacy students should expect questions about bone protection and blood sugar during long courses of glucocorticoids, as these are common review points.
This page offers background on a diagnosis term. New vision changes need same day care, and only your own clinicians can say whether GCA applies to you.
Frequently asked questions
What does GCA mean in medical terms?
GCA means giant cell arteritis, a vasculitis of bigger arteries, with the temple arteries the classic site. It mainly affects people over 50.
Is GCA the same as temporal arteritis?
Yes, they are the same condition. Temporal arteritis is the older name, based on the arteries most often involved, while giant cell arteritis is the term used in most current notes.
How is GCA diagnosed?
Doctors combine symptoms and exam findings with blood markers such as ESR and CRP, then confirm with a temporal artery biopsy or imaging such as ultrasound.
Why is GCA an emergency?
The inflammation can cut off blood flow to the optic nerve and cause sudden permanent vision loss. That is why treatment is often started as soon as GCA is suspected.