Geriatric Depression Scale: How to Use the GDS-15 at Home

What the GDS-15 Actually Measures

The Geriatric Depression Scale Short Form (GDS-15) is a 15-question screening tool designed specifically for older adults. Unlike broader mental health assessments, it strips out physical symptoms — fatigue, appetite changes, aches — that are common in aging but confuse depression screening. Every question uses a simple yes/no format, which makes it practical for people with shorter attention spans or mild cognitive difficulties.

Sheikh and Yesavage condensed the original 30-item scale in 1986, and validation studies consistently show it catches depression with 81–89% sensitivity and 75–78% specificity in primary care settings. That's not a diagnosis, but it's a reliable early-warning system.

How to Score It

Ten of the 15 questions indicate depression when answered "yes." The other five — questions 1, 5, 7, 11, and 13 — indicate depression when answered "no." Each depression-indicating answer scores one point.

• 0–4: Normal range
• 5–9: Mild depression — worth a conversation with the doctor
• 10–15: Moderate to severe — schedule a clinical evaluation promptly

A shift of 2 or more points between screenings is clinically meaningful. If your parent scored a 4 last month and now scores a 7, that's not noise — something changed.

When the GDS-15 Doesn't Work

The tool relies on self-reporting, which means it loses validity when the person can't reliably answer questions. If your parent has moderate-to-severe cognitive impairment — roughly a Mini-Mental State Examination score below 17 — switch to the Cornell Scale for Depression in Dementia (CSDD). The CSDD uses a dual-interview format where the clinician talks to both the patient and a caregiver, and it was built specifically for people living with dementia.

There's also a gap the GDS-15 can't close on its own: distinguishing depression from normal grief. If your parent recently lost a spouse, a score of 7 might reflect acute bereavement rather than clinical depression. Grief tends to come in waves triggered by specific reminders, while depression flattens everything — pleasure, motivation, self-worth — across the board. If symptoms persist past two months without relief, push for a formal evaluation regardless of the score.

How to Administer It at Home

Pick a calm moment. Not right after a difficult phone call with a sibling, not during a medical appointment where your parent already feels scrutinized. Read each question aloud and record their answer. Don't coach or interpret — if they say "I don't know," note it and move on.

Run the screen every two weeks and keep a written log with dates and scores. This log becomes powerful clinical evidence when you walk into the doctor's office. Instead of saying "Mom seems sad," you hand them a documented trend line: "Her GDS-15 went from 3 to 8 over six weeks."

Other Screening Tools Worth Knowing

The PHQ-2 is a two-question pre-screen that primary care doctors sometimes use as a first pass: "Over the past two weeks, how often have you been bothered by little interest or pleasure in doing things?" and "How often have you been bothered by feeling down, depressed, or hopeless?" A positive PHQ-2 triggers a longer assessment. It's useful for very resistant parents because the questions feel conversational rather than clinical.

For parents living with dementia, the Cornell Scale remains the standard. It takes 15–20 minutes and requires a trained clinician, but it catches what a self-report tool physically cannot.

What to Do With the Results

A score of 5 or above isn't a reason to panic — it's a reason to act. Book an appointment with your parent's primary care physician and bring the completed GDS-15 with you. Ask the doctor to rule out medical causes first: thyroid dysfunction, vitamin B12 deficiency, and medication side effects all mimic depression in older adults. Request a medication review against the AGS Beers Criteria to flag drugs that could be making things worse.

If you want a structured approach to screening, medication auditing, and the conversation with the doctor, the Spotting Elder Depression toolkit walks through the full sequence — from first screening to treatment coordination — with ready-to-use worksheets for each step.