Geriatric Syndrome
Failure to Thrive in Older Adults: Workup
Adult failure to thrive is a syndrome — not a diagnosis — characterized by weight loss, decreased appetite, poor nutrition, inactivity, and often dehydration, depression, and cognitive decline. It is a final common pathway for many treatable conditions, and a structured workup frequently uncovers reversible causes. This guide outlines the four key domains to evaluate: impaired physical function, malnutrition, depression, and cognitive impairment. It covers history-taking, targeted exam, screening tools (PHQ-9, MoCA, MNA, gait speed), labs (CBC, CMP, TSH, B12, vitamin D, albumin, prealbumin), medication review for appetite suppressants, and when to involve dietitian, PT/OT, social work, and palliative care. The goal is to identify modifiable contributors early — before the trajectory becomes irreversible — and to recognize when failure to thrive signals end-of-life and warrants a goals-of-care conversation.
Full clinical workflow, red flags, dosing, and documentation below. Subscribe to read the full guide.
Failure to Thrive / Fatigue
Failure to Thrive / Fatigue & Decreased Energy
Description, not diagnosis · Identify drivers · Address modifiable causes.
Assessment
How to identify in clinic
- Global decline: weight loss + functional decline + social withdrawal
- The "dwindles" — progressive loss of energy, appetite, and engagement
- Often multifactorial — no single cause explains the picture
- Check weight trend over 3–6 months
Workup framework: DWINDLES
- D — Depression / Dementia
- W — Wasting (malignancy, chronic disease)
- I — Infection (chronic UTI, TB, endocarditis)
- N — Nutritional deficiency
- D — Dysphagia
- L — Low socioeconomic status / loneliness
- E — Elder abuse / neglect
- S — Swallowing problems / Sensory loss
Labs to order
- CBC, BMP, TSH, B12, albumin/prealbumin
- LDH, ESR/CRP if malignancy or infection suspected
- UA, chest X-ray
- Depression screening (PHQ-9 or GDS)
- Cognitive screening (MoCA or MMSE)
Management
Non-pharmacologic
- Treat underlying causes (depression, infection, malignancy)
- Nutritional support — calorie-dense meals, oral supplements (Ensure, Boost)
- Social engagement — reduce isolation
- PT/OT for functional reconditioning
- Address caregiver adequacy and home support
- Meal delivery services (Meals on Wheels)
- Dental evaluation if chewing problems
Medications
- Megestrol acetate — appetite stimulant, but evidence is weak and risks are real (DVT, adrenal suppression)
- Mirtazapine 7.5–15 mg — if concurrent depression + poor appetite
- Dronabinol 2.5 mg BID — last resort appetite stimulant
- Vitamin D if deficient
- Treat hypothyroidism, B12 deficiency
Avoid
- Restrictive diets in malnourished older adults
- Megestrol as first-line — risks outweigh benefits in most cases
Refer & Document
When to refer
- Dietitian — nutritional assessment and meal planning
- Social work — if isolation, caregiver issues, or financial barriers
- Oncology — if malignancy suspected
- Palliative care — if decline is progressive despite intervention
- Speech therapy — if dysphagia contributing
Documentation must include
- Weight trajectory with dates
- Functional status (ADLs/IADLs)
- Depression and cognitive screening results
- Workup results and differential
- Nutritional plan
- Goals of care discussion if declining trajectory
Clinical Pearl
"Failure to thrive" is a description, not a diagnosis. If you write it in the chart, follow it with the actual diagnoses driving the decline. The most commonly missed causes are depression, medication side effects, and social isolation. Always check medications first.
Evidence sources
- · AGS guidance on weight loss in older adults
- · Robertson RG, AAFP 2004
Review status
Last reviewed: 2026-04
Reviewed by the MyClinicianGuide editorial team. Cadence: annual.
Educational reference for licensed clinicians (NP, PA, MD, DO). Not a substitute for clinical judgment, institutional protocols, or specialty consultation. Apply in context of the full clinical picture, patient goals, and current standards of care. See About AI guidance for AI-related limitations.
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