NANDA-I 2024-2026 edition · Reviewed November 2, 2026 by the editorial team
Diagnosis at a glance
| Code | 00420 |
|---|---|
| Label | Risk for inadequate fluid volume |
| Before (2021-2023) | Former code 00028 |
| Spanish label | Riesgo de volumen de líquidos inadecuado |
| Domain | 2. Nutrition |
| Class | 5. Hydration |
| Type | Risk |
| Status | Current |
What changed in 2024-2026
The label changed: "deficient fluid volume" became "inadequate fluid volume," and the code went from 00028 to 00420. The clinical use is the same: preventing dehydration and hypovolemia before they develop. The same thing happened to the actual problem: Deficient Fluid Volume (00027) is now Inadequate Fluid Volume (00421). If your materials are from the previous edition, you will see 00028; for new assignments, use 00420.
What it means
The patient has no signs of dehydration yet but is losing more fluid than they replace, or is in a situation that could lead to it. Without intervention, circulating blood volume drops and tachycardia, hypotension and decreased urine output follow.
Explanation written by our team. The official definition is in the NANDA-I 2024-2026 book.
When to use it
Clinical situations where it commonly shows up. The diagnosis is confirmed by your assessment, not by the medical diagnosis.
- Vomiting, diarrhea or an NG tube to suction.
- Acute pancreatitis, peritonitis or bowel obstruction, which shift fluid out of the vessels into the abdomen and tissues.
- Persistent fever, tachypnea or heavy sweating.
- Prolonged NPO status before or after surgery.
- Diuretic therapy or hyperglycemia with glycosuria.
- Older adults or young children who do not ask for water or depend on others to drink.
What to assess
- Intake and output every shift: everything in (oral, IV, tube) and everything out (urine, emesis, drains, liquid stools).
- Hourly urine output when the risk is high; in adults, expect at least 0.5 mL/kg/h.
- HR, BP and orthostatic changes when moving from lying to sitting or standing.
- Mucous membranes, thirst, skin turgor and capillary refill.
- Daily weight, on the same scale at the same time.
- Urine specific gravity, sodium, potassium, BUN, creatinine and hematocrit when available.
- Whether the patient can drink independently, and whether they have thirst, nausea or trouble swallowing.
Risk factors
What makes the problem more likely, and what nursing can monitor or modify.
- Active losses from vomiting, diarrhea, drains or an NG tube.
- Poor oral intake due to nausea, pain, sedation or NPO status.
- Fever, tachypnea or heavy sweating.
- Difficulty accessing fluids: immobility, dependence on others or cognitive impairment.
- Not knowing how much to drink when there are losses.
- Decreased thirst, common in older adults.
- Use of diuretics or laxatives without monitoring losses.
At-risk populations
- Adults over 65.
- Infants and children under 5.
- People who depend on others to eat or drink.
- Patients who are NPO for surgery.
- People who work or exercise intensely in the heat.
Associated conditions
- Acute pancreatitis.
- Gastroenteritis with vomiting or diarrhea.
- Uncontrolled diabetes with hyperglycemia and glycosuria.
- Extensive burns.
- Abdominal surgery with drains.
- Diuretic therapy.
Risk factors are what nursing can monitor or correct: losses, intake, access to fluids. Pancreatitis, surgery or uncontrolled diabetes are associated conditions: they raise the risk but are not treated with independent nursing interventions. If your program requires it, write them as "in a patient with...".
How to write it (PES)
Risk for Inadequate Fluid Volume related to losses from an NG tube to suction, fever, and NPO status, in a patient with acute pancreatitis (associated condition).
This is a risk diagnosis, so it has no "as evidenced by" clause. If tachycardia, hypotension, oliguria or dry mucous membranes are already present, the diagnosis is Inadequate Fluid Volume (00421).
Example written by our team for a fictional patient. Adapt it to your own patient's data. Build your statement with the PES generator.
Goals / expected outcomes
Written in measurable terms: what, how much and by when.
- Patient maintains urine output ≥ 0.5 mL/kg/h each shift during the first 72 hours.
- Patient maintains HR < 100 bpm and systolic BP ≥ 90 mmHg, or within their usual range, throughout the hospital stay.
- 24-hour fluid balance stays within the goal set by the provider.
- Patient maintains moist mucous membranes and shows no orthostatic changes when getting up.
- Before discharge, patient or family member explains how much fluid to drink and which signs of dehydration to watch for.
Nursing interventions and rationales
| Intervention | Rationale |
|---|---|
| Record intake and output every shift and total it every 24 hours. | Reveals hidden losses before they cause symptoms. |
| Measure hourly urine output in patients with an indwelling urinary catheter or at high risk. | Urine output is one of the first parameters to drop when volume is low. |
| Weigh the patient daily, before breakfast, on the same scale. | Sudden weight loss reflects water loss, not fat loss. |
| Monitor HR, BP and signs of hypovolemia every 4 hours or more often depending on acuity. | Tachycardia usually appears before hypotension. |
| Administer the prescribed IV fluids at the ordered rate and monitor the IV site. | They replace what is lost when oral intake is not enough or is on hold. |
| Offer oral fluids at regular intervals if allowed, with the cup within reach. | Many patients do not ask for water; offering it keeps intake from depending on thirst. |
| Measure and describe losses: emesis volume, NG drainage, number and type of stools. | The provider adjusts fluid replacement based on real data. |
| Monitor sodium, potassium and creatinine, and report abnormal values. | GI losses carry electrolytes with them, and low volume can injure the kidneys. |
| Teach the family to recognize intense thirst, scant or dark urine, and dizziness on standing. | They keep monitoring at home and seek care in time. |
NOC outcomes and NIC interventions
Outcomes (NOC) and interventions (NIC) that published sources link to this diagnosis. Pick the ones that fit your patient.
NOC outcomes
- 0601Fluid Balance
- 0602Hydration
- 1902Risk Control
NIC interventions
- 4120Fluid Management
- 4130Fluid Monitoring
- 4180Hypovolemia Management
- 6610Risk Identification
Linkages drawn from care plans published by health services, universities and nursing journals, originally set for the previous diagnosis (00028 Risk for deficient fluid volume). Labels may vary depending on the NIC and NOC edition your facility uses.
Case study: Acute pancreatitis in the first few hours
Patient. 45-year-old woman, 68 kg, admitted 6 hours ago with acute gallstone pancreatitis. She is NPO, with an NG tube to suction for vomiting, and has IV fluids ordered.
Assessment
- HR 94 bpm, BP 118/72 mmHg, RR 20 breaths/min, temperature 38.1 °C (100.6 °F).
- Urine output over the last 3 hours: 150 mL (0.7 mL/kg/h).
- NG drainage: 400 mL in 6 hours.
- Mucous membranes still moist; capillary refill 2 seconds.
- No orthostatic changes when sitting up.
- Hematocrit 44%; creatinine 0.8 mg/dL.
Nursing diagnosis
Risk for Inadequate Fluid Volume related to losses from an NG tube to suction, fever, and NPO status, in a patient with acute pancreatitis (associated condition).
Goal
Patient maintains urine output ≥ 34 mL/h (0.5 mL/kg/h) and HR < 100 bpm during the first 48 hours.
Interventions
- Intake and output every shift with a 24-hour total.
- Hourly urine output and vital signs every 2 hours during the first 24 hours.
- IV fluids at the prescribed rate; notify the provider if urine output falls below 34 mL/h for two hours in a row.
- Document the volume and appearance of gastric drainage.
- Monitor hematocrit, BUN and creatinine as ordered.
Evaluation
At 48 hours, urine output is 45-60 mL/h, HR 84-92 bpm, mucous membranes are moist and hematocrit is 40%. The diagnosis remains active while she is NPO with the NG tube to suction; it is resolved once she tolerates oral intake and the tube is removed.
How it differs from similar diagnoses
- Inadequate fluid volume (00421): Signs of hypovolemia are already present: tachycardia, hypotension, oliguria, dry mucous membranes. This is the actual problem (formerly Deficient Fluid Volume, 00027).
- Risk for impaired fluid volume balance (00492): Used when the risk could go toward either deficit or excess, as in long surgeries or patients with heart failure receiving IV fluids.
- Risk for impaired water-electrolyte balance (00491): The focus is on sodium, potassium or other electrolytes, not on volume.
Common mistakes
- Adding "as evidenced by" to a risk diagnosis.
- Keeping the risk diagnosis when oliguria or hypotension is already present: the diagnosis becomes Inadequate Fluid Volume (00421).
- Writing "related to pancreatitis" as the only factor: it is an associated condition.
- Still using code 00028 in assignments based on the 2024-2026 edition.
Used in these conditions
Other diagnoses in the Hydration class
Domain 2, Nutrition. See every diagnosis in this domain.
Frequently asked questions
What is the NANDA code for risk for inadequate fluid volume?
00420. It belongs to Domain 2 (Nutrition), Class 5 (Hydration). It was formerly Risk for Deficient Fluid Volume (00028).
What happened to Risk for Deficient Fluid Volume?
In NANDA-I 2024-2026 its name and code changed: it is now Risk for Inadequate Fluid Volume (00420). If your nursing program uses the previous edition, you will see 00028.
What about Deficient Fluid Volume (00027)?
It is now Inadequate Fluid Volume (00421). Use it when dehydration or hypovolemia is already present.
What urine output is considered low in an adult?
Less than 0.5 mL/kg/h for several hours in a row. For a 70 kg adult, that is about 35 mL per hour.
Why does pancreatitis put patients at risk for dehydration?
The inflammation causes fluid to leak out of the vessels into the abdomen and tissues. Add vomiting, NPO status and the NG tube, and these patients need strict intake and output.
Study material: the explanation, characteristics, factors, examples and case study on this page were written by our editorial team. The official text for Risk for inadequate fluid volume (00420) is in NANDA International Nursing Diagnoses: Definitions and Classification 2024-2026. This page does not replace clinical judgment or your facility's protocols.
Classification sources: NANDA-I 2024-2026, Thieme supplement · Elsevier summary of changes · Spanish edition table of contents · NOC/NIC: source 1, source 2. Reviewed November 2, 2026.