Parkland Formula

What is the Parkland formula?

The Parkland formula for burns is a standardized burn equation used to estimate how much fluid a patient may need during the first 24 hours after a major burn. Clinicians use it to calculate an initial amount of crystalloid fluid based on the patient’s body weight and burn size. The goal is to restore intravascular volume and help maintain blood flow to the organs. Because major burns can quickly lead to shock, early fluid replacement is an important part of care.

How is the Parkland formula calculated?

The traditional burn equation estimates the first 24-hour fluid volume as 4 mL of fluid multiplied by the patient’s weight in kilograms and the percent of total body surface area (TBSA) burned. Current burn guidance increasingly emphasizes lower starting volumes, often 2 mL/kg/%TBSA, with adjustments based on the patient’s response. To support blood flow, the team gives half of the calculated volume within the first eight hours after the injury. The remaining 50% is given over the next 16 hours. Lactated Ringer solution is the preferred crystalloid because it is a balanced fluid commonly used for large-volume burn resuscitation.

When is the Parkland formula indicated?

Clinicians use the Parkland formula for burns for adults and children with burns involving about 20% or more TBSA who require intravenous fluid resuscitation, though thresholds may be lower in some patients or clinical settings. Accurately determining burn size involves using standardized charts, such as the Rule of Nines or the Lund-Browder diagram. Only partial-thickness and full-thickness burns are included in the TBSA calculation; superficial, first-degree burns are excluded. The formula is mainly used for major cutaneous burns; isolated inhalation injury without significant skin burns is not calculated with a TBSA-based formula, and electrical or chemical burns often require specialist adjustment. Individuals with pre-existing heart or kidney disease often require more conservative, tailored fluid goals.

What are the limitations and considerations of the Parkland formula?

A significant limitation of this formula is that it provides only an initial estimate. Over-resuscitation can lead to fluid creep, a condition where excessive fluid administration results in complications like pulmonary edema or abdominal compartment syndrome. Clinicians must perform hourly assessments of urine output and overall clinical status to detect these risks early. Because the formula only covers the first 24 hours of care, the medical team must reassess fluid needs after the first 24 hours, including ongoing losses and maintenance requirements. Cases involving sepsis, inhalation injury, electrical injury, delayed resuscitation, or rhabdomyolysis often require advanced monitoring and individualized fluid goals.

How is the Parkland formula applied in clinical practice?

In practice, the team first confirms the patient’s weight and estimates the burned total body surface area. The resuscitation clock starts at the time of injury, not the time of hospital arrival, so the first half of the fluid is given on schedule. Nurses set infusion pumps to deliver Lactated Ringer solution at the calculated hourly rate. Clinicians then adjust the rate to maintain a urine output of about 0.5 mL/kg/hr in adults or 1 mL/kg/hr in children. Serial monitoring of electrolytes, lactate, and acid-base status helps identify complications during the major fluid shifts that follow severe burns.

What are the most important facts to know about the Parkland formula?

• The Parkland formula for burns provides an initial estimate for crystalloid resuscitation based on weight and TBSA.
• The traditional calculation uses 4 mL/kg/%TBSA over 24 hours, with 50% of the total fluid given in the first eight hours after injury and the rest over the next 16 hours.
• Current burn guidance increasingly emphasizes lower starting volumes and close titration rather than using the formula as a rigid protocol.
• Lactated Ringer solution is the standard fluid used to help restore intravascular volume during initial burn resuscitation.
• Clinicians must monitor for fluid creep to prevent life-threatening complications like tissue edema or compartment syndrome.
• Titration of the burn equation depends on meeting hourly urine output goals and maintaining overall clinical stability.